I know it's a barrel connector, I was hoping somebody could tell me exactly which one because there are *lots*, all slightly different.Sometimes called Coaxial Connectors, Plugs or Jacks, Ive always known them as DC Barrel Connectors for Laptops, trick is to find out what size they are (Alphabet Band) and to what type of International Standard as there are lots of them, they may fit and work but if not correct they will not perform correctly under a DC Current Load.
That's the alternative, but I'd rather keep the AC adapter intact if possible (the router will probably be on a Three contract) -- a barrel connector is dirt cheap, it's just a question of finding the right one...Why not just break the cable and connect directly to your 12v power supply source using the connector you have. Should you wish to return to using the wall plug just join the cable with a suitable inline connector of your choice at the point you cut it.